ISO 4126-3:2006 PDF

Scope: This part of ISO 4126 specifies the requirements for a product assembled from the in-series combination of safety valves or CSPRS (controlled safety pressure relief systems) according to ISO 4126-1, ISO 4126-4 and ISO 4126-5, and bursting disc safety devices according to ISO 4126-2 installed within no more than five pipe diameters from the valve inlet. It specifies the design, application and marking requirements for such products, which are used to protect pressure vessels, piping or other enclosures from excessive pressure, and which comprise the bursting disc safety device, a safety valve or CSPRS and, where applicable, a short length of connecting pipe or spool piece. In addition, it gives a method for establishing the combination discharge factor used in sizing combinations.

ISO 4126-3:2006 Referenced Document

ISO 4126-1:2004 Safety devices for protection against excessive pressure - Part 1: Safety valves
ISO 4126-2:2003 Safety devices for protection against excessive pressure - Part 2: Bursting disc safety devices
ISO 4126-4:2004 Safety devices for protection against excessive pressure - Part 4: Pilot-operated safety valves
ISO 4126-5:2004 Safety devices for protection against excessive pressure - Part 5: Controlled safety pressure relief systems (CSPRS)
ISO 4126-6:2003 Safety devices for protection against excessive pressure - Part 6: Application, selection and installation of bursting disc safety devices

2020 ISO 4126-3:2020 Safety devices for protection against excessive pressure — Part 3: Safety valves and bursting disc safety devices in combination
2006 ISO 4126-3:2006 Safety devices for protection against excessive pressure - Part 3: Safety valves and bursting disc safety devices in combination